Company

StepFun

阶跃星辰

StepFun (阶跃星辰) is a Chinese foundation-model startup founded in April 2023, backed by Qiming Venture Partners, and one of the country's most comprehensive base-model developers — by mid-2025 it had released 18 self-developed models, 12 of them multimodal . Its Step-series matrix spans language, multimodal, reasoning, voice, and end-cloud models: the Step 3 base model set a new industry high for inference efficiency, a GUI open-source model for phones/cars/PCs followed in December 2025, and its Step Audio R1.1 topped the Artificial Analysis global voice leaderboard in January 2026; open-source Flash variants (Step 3.5 Flash, Step 3.7 Flash) target agent workflows . On the commercial side it pursues an "AI + devices" strategy — per Qiming, as of end-2025 its models shipped in over 42 million phones (OPPO, Honor, ZTE among partners) and a Geely in-car AgentOS whose first model sold ~40,000 units in three months . In early 2026 it closed a 5+ billion RMB B+ round, the largest single raise in China's LLM sector in the prior 12 months . Founder and CEO Jiang Daxin frames the strategy as returning to real application scenarios rather than chasing raw benchmark gains .

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StepFunCompany
阶跃星辰
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